helper.yml

  tasks:
    - ios_facts:
        provider: "{{ creds }}"

    - ios_config:
        provider: "{{ creds }}"
        lines:
          - ip helper-address 1.1.1.1
        parents: interface {{ item }}
      with_items: "{{ dhcp_interfaces }}"

    - name: Check for extra DHCP helpers
      ios_command:
        provider: "{{ creds }}"
        commands:
          - "show run interface {{ item }}"
      with_items: "{{ ansible_net_interfaces }}"
      register: new_output

    - debug:
        var: item
      when: '"helper" in item.stdout[0]'
      with_items: "{{ new_output.results }}"
      register: new_output2

    - assert:
        that: '{{ new_output2.results | selectattr("skipped", "undefined") |  map(attribute="item.item") | list | symmetric_difference(dhcp_interfaces) }} == []'
        msg: "Interface has 'ip helper' configured and shouldn't"